refactor RDS modulator parameters and file handling; remove deprecated commands

src/control_pipe.c

@@ -7,40 +7,29 @@
 static int fd;
 static struct pollfd poller;
 
-/*
- * Opens a file (pipe) to be used to control the RDS coder.
- */
 int open_control_pipe(char *filename) {
     fd = open(filename, O_RDONLY | O_NONBLOCK);
     if (fd == -1) return -1;
     
-    /* setup the poller */
     poller.fd = fd;
     poller.events = POLLIN;
     return 0;
 }
 
-/*
- * Polls the control file (pipe), and if a command is received,
- * calls process_ascii_cmd.
- */
 void poll_control_pipe(RDSModulator* mod) {
     static unsigned char pipe_buf[CTL_BUFFER_SIZE];
     static unsigned char cmd_buf[CMD_BUFFER_SIZE];
     int bytes_read;
     char *token;
     
-    /* check for new commands - return early if none */
     if (poll(&poller, 1, READ_TIMEOUT_MS) <= 0) return;
     if (!(poller.revents & POLLIN)) return;
     
-    /* read data from pipe */
     memset(pipe_buf, 0, CTL_BUFFER_SIZE);
     bytes_read = read(fd, pipe_buf, CTL_BUFFER_SIZE - 1);
     
     if (bytes_read <= 0) return;
     
-    /* process each command line */
     token = strtok((char *)pipe_buf, "\n");
     while (token != NULL) {
         size_t cmd_len = strlen(token);